INTRODUCTORY ESSAY. 221 15,000 feet is of course far from complete; those with an as- terisk (*) have been observed above 17,000 feet. Corydalis Tibetica. *Aster atpinus. *Draba aizoides and others. * Artemisia. *Parrya. *Leontopodium. *Cerastiuxu. *A31ardia. *Lychnis. *Pyrethrum. *Thylaeospermuin, Ligularia. *Myricaria. *Nepeta multilracteata. *Biebersteinia odora. Cynoglossum. Oxytropis cTiiliopJiylla. Lithospermum euckromon. * Astragali, several. *Gymnandra. Thermopsis. *Primula, Potentilla Balessovii. Bheum. „ anserina. Ephedra. * „ Meyeri. *Carices. *Sibbaldia procumbens, var. *Stipa. Ghamaerhodos sabulosa. *Lloydia serotina. *Sasifraga cwnua. *Pestuca ovina, and other *Seda. Grasses. *SaussTirese? three species. Owing to the aridity of the climate all Crypt Offamice are extremely rare: only three or four Ferns ocuur; Mosses are scarcely more common, and never fruit.^ A few crustaceous Lichens, on stones, and half-a-dozen Fungi, including several British species, have been collected. Western Tibet is tolerably well known botanically*'. It was first explored by Dr, Falconer, who visited Hasora, Dras, and Balti, and made a fine Herbarium, which is unfortunately still unexamined and undistributed, at the India House. Jacquemont visited Piti in 1830, and Dr. Royle's collec- tors were there also. Dr. Thomson's collections were made in Piti, Balti, Eupchu, Ladak, Zanskar, Nubra, and Dras. Captain Henry Strachey made an excellent collection in the * There are a few plants in the Wallichian Herbarium, collected by Moor- croft, the first explorer in modern times of Ladat, and ticketed as from that place, but they are mostly outer Himalayan plants.